What rating should the kill switch be for our conversions, I've several R S pushbutton switches rated 3 A at 125 VAC, 1.5 at 250 VAC, they're nice because they're easy to conceal, not sure if they'll take the heat though.

Vibration is the killer?

Almost any rating will work. Be sure to get a sturdy switch. Vibration can kill it. I use a DPST heavy duty switch from Radio Shack or a local electronics supply house. You actually only need a SPST, but the double poles give a little more reliability.

Dr.1